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The trope I'm exploring with Space Crowd Saturday existed before Star Wars, but 'A New Hope' still stands as the biggest popularizer of the concept. Here's Ralph McQuarrie's Mos Eisley Cantina art. 

It’s been reused many times since, appearing in the Terran Trade Authority book 'Spacewreck' and as the cover to a 1982 French translation of 'Dune.' In 1984, a poster artist swiped it for the movie 'Def-Con 4'